Door lock



Aug. 12, 1941. c, 2,251,937 I filed w, 1m a mt -amt 1 Aug. 12, 1941 c. HOFFMAN DOOR LOCK Filed Nov. 1d, 1938 3 Sheets-Sheet 2 7.9 .55 2a 0 :0 7 5 f l llWllllll Aug. 1-2, 1941. c. HOFFMAN- DOOR LOCK Filed Nov. 10, 1958 3 Sheets-Sheet 3 1 'ZIiIIIIII/IIIIIIIIIIA Patented Aug. 12, 1941 DOOR LOCK Carl Hoffman, Allentown, Pa., assignor of onehali' to Samuel McCurley, Allentown, Pa.

Application November 10, 1938, Serial No. 239,753

13 Claims.

My invention relates to improvements in locks, and while it has to do especially with coin controlled door locks such as are used for the doors of public wash rooms, lavatories of hotels, etc., it is not, in its broadest aspects limited thereto.

Locks of this kind now on the market are characterized by the following features:

(1) An outer knob having a coin controlled means for establishing operative connection between the same and the bolt when a coin is inserted into a slot in the lock casing;

(2) An inside knob having a constant operative connection with the lock bolt;

(3) A look casingcarried indicator denoting whether or not a particular booth or lavatory is occupied and which is operated from its Vacantindicating position to its Occupied indicating position upon operation of the outside knob, and back to its Vacant indicating position upon operation of the inside knob;

(4) A coin-guiding slideway and communicating coin-receiving receptacle. 5

However such locks of the prior art in addition to being very costly due to complexit y of construction are open to serious objection because there is no way for the wash room attendant to detect the many, and constantly increasing, instances of operation of the lavatory locks through use of slugs in lieu of coins. This slugusing practice means to the hotel, over a period of months, a substantial loss of revenue from its public lavatory locks.

It is therefore one of the primary objects of my invention not only to greatly simplify locks of this class and thus reduce the cost thereof, but also to provide means which will enable the wash room attendant to readily determine, before a patron departs, whether the latter has used 'a slug or a coin in the operation of a particular lock.

The invention also resides in certain novel features of construction, combination and arrangement of the various parts and in modes of operation thereof as will be readily understood and appreciated by those skilled in the art upon reference to the accompanying drawings, in conjunction with the detailed description thereof, to

follow.

It is to be understood that the drawings and descriptive matter deal with what is regarded as a preferred example of the invention. However same is susceptible of many changes and modifications within the spirit and scope of the subject matter claimed hereinafter.

In the drawings, wherein the same reference characters have been used to designate, the same ciated elements have been removed, and that another portion of the coin guideway has been broken away;

Figure 2 is a view similar to Figure l but show-,- I

ing the outside" knob-operated assembly in place;

Figure 3 is a side elevational view of the assembled casing with a previously used coin at thedisplay window and the bolt protracted- 'the upper part of easing closure being broken away to illustrate the complete assembly of in-:

terior parts;

Figure 4 is a front elevational view of the assembled casing;

Figure 5 is a top plan view of the casing and showing the occupancy indicator in Vacant indicating position;

Figure 6 is a vertical sectional view of the re 'movable portion of the coin guideway, along with the coin-operated means which is carried thereby and is operable to operatively connect certain elements of the outside" knob-operated bolt-retractingmeans, a portion of which latter is shown;

Figure 7 is a perspective view of the outside" knob-operated bolt-operating means, and. associated coin release means actuator of Figures 2 and 3;

Figure 8 is a fragmentary perspective view of the lower end of the fixed portion of the coin guide shown in Figure 3, and showing the movable trip element which supports a previously used coin opposite the display window of Figure 3 until the lock is again operated by the outside knob;

Figure 9 is a bottom plan view of coin operated lever assembly of Figures 3 and 6.

Referring specifically to the drawings, numeral l5- designates generally the lock casing which comprises the interfltting mechanismcarrying and closure sections l6 and II respectively. The open bottom end of casing.l5 is adapted to be closed by the coin receptacle l8 as best shown in Figure 4.

The usual, or any preferred means, including the key operated lock 19 ofclosure section II ing l5.

Figure 5 illustrates that casing I5 is mounted on the outer surface of the lavatory door 2| as usual. Each of Figures 1, 2 and 3 show the mechanism-marrying section |6 as having the back wall |-6a, side walls I61), I60 and top wall id; and disclose the back wall |6a as providing the counter-bored top and bottom holes 22, 22' respectively, for the headed bolts or screws (not shown) which secure casing I5 to door 2|. The top holes 22 will preferably be oversized with respect to the heads of the screws or bolts that are used, and are of the key hole type in that they have upwardly extending communicating slots 22a to receive the shanks of screws previously mounted in the door 2|. This facilitates both mounting and dismounting of the lock casing |5 as will be obvious.

The latch bolt 23 works in the slideway 24 in the back wall |6a of casing section l6 and is normally projected through a slot 25 in the forwardly positioned side wall |6c by the coil spring 26 (Figure 3) acting through the partially rotatable sleeve 21 and its fixedly carried arm 26 which constantly bears against bolt lug 23a. It is also to be noted that the upper portion of the lug 23a has a lateral extension 23b which is shown in end elevation in Figures 2 and 3. The function of this latter will be explained later.

Figures 1 and 2 show slideway 24 as having a stop pin 26 for limiting retraction of bolt 23; and likewise a stop post 36 for limiting clockwise movement of sleeve 21 through engagement of the sleeve-carried arm 28 therewith at approximately the time that the lug 23a of bolt 23 enends and are adapted to be connected by a headless screw 34 which is insertible into place through hole 35 in said sleeve 33, as shown in Figure 5. Mounted on the reduced square portion 32a adjacent the reduced inner end 321) of shaft 32 (see Fig. 2) is the lower end of a boltretracting lever 36. A nut 31 fast on shaft portion 32b holds lever 36 in place. Lever 36 is irregularly shaped, as shown, and has the cam portion 36a for retracting the bolt 23 when shaft 32 is rocked counter-clockwise as viewed in Figures .1, 2 and 3. Lever 36 is curved rearwardly as at 36b from a point adjacent cam portion 36a, so as to clear sleeve 21 and then extends upwardly and forwardly. The upper end of lever side will now be described. Turning to Figures 2 and 7, it will be noted that sleeve 21, previously mentioned, has the beveled flange base 21a which is adapted to seat in the circular recess 4| in wall |6a (see Fig. 1). The arcuate.

edged plate 42 secured by screws 42a, and the head of an opposed screw 43, also carried by wall 56a overlie sleeve flange 21a to rotatably mount Figures 2, a and 7 indicate within said knoboperated sleeve 21 the short relatively rockable shaft 46. These views also disclose said shaft 46 as carrying the irregularly shaped lever 41 whichextends therethroughand likewise the stem 46a of an operating fork 48 for a counter 49 which is carried by the adjacent end wall |6c of the mechanism-carrying section l6 of casing l5. Sleeve 21 has opposed L-shaped slots having longitudinally extending slots or legs 56 open at one end and opening at the other end into oppositely directed, transverse slots or foot portions 56a. The portions 50a receive the protruding portions of lever- 41 and define the limits of relative rotative movement of shaft 46 and sleeve 21. By directing the two foot portions 56a in opposite directions, limited relative rotation of the shaft 46 together with the extensions thereof comprising the lever 41 and the sleeve 21 is possible. The legs 56 permit the insertion of the lever 41 into the sleeve 21 to a point opposite the foot portions 56a. Sleeve 21 also has a transverse slot 5| of approximately the samelength as the foot portions 50a of L- shaped slots 53, and it is through this latter slot thatthe stem 48a of the counter operating fork extends.- The slot 6|, like the foot portions 56a, permits limited relative rotation of shaft 46, together with stem 48a carried thereby and sleeve 21 when the shaft and sleeve are not coupled by the coupling pin 61 (to be described later).

It will be understood from Figure 3 that the lower part of lever 41 normally overlies the lower part of lever 36 and that the lug 23a is of suflicient width to be contacted by either the lever 36 or lever 41. When the carrying shaft 46 of lever 41 is coupled to outerknob sleeve 21 by the to their functions. The mechanisms with which 36 has a lateral lug 36c upon which is anchored one end 2611 of coil spring 26-it being remembered that the other end 26b of such spring is anchored to said rotatable sleeve 21. The advantages of this construction will be explained later on.

Post 36 engaging notch 36dadjacent the upper end of lever 36 limits clockwise movement of same under the action of spring 26; and a screw 39 carried by wall I61: and located in an oversized cutout 46 in the rear edge of the lower end of lever 36 defines the limits of its movement in each direction, as best indicated in Figto release a previously used coin 52 from position in casing window 53 (see Figure 3).

Inwardly of latch detent housing 41a, lever 41 has a lateral lug or cam 41c which is adapted to release a previously insertd"coin to display position in window 53 after detent 41b has acted to release coin 52.

And finally, the upper end of lever 41 has the laterally turned portion 41d for engaging the depending actuator pin 16a of the indicator operating slide 18 '(see Fig. 5) to actuate said slide to actuate the indicator 15 to Occupied indicating position. These parts will be hereinafter described.

The coin-operated means whereby the outside knob-operated sleeve 21 is coupled to the carrying shaft 46 of lever 41 will now be described.

As shown in Figure 3, the coin entry slideway 55 has its entry end adjacent the forward side wall 160 just below a slot 56 in top Wall 1611 of the mechanism carrying casing section I6, which latter slot registers with a narrower coin slot 51 (see Fig. in the closure section l1 of casing l5. Entry slideway 55 inclines downwardly to the opposite side wall |6b of casing section 16, and adjacent its lower end there is a hump 55a therein. This hump 55a in cooperation with the.

adjacent side wall lib causes the downwardly sliding coin to assume a vertical position upon passing thereover, so as topass into the terminal slot 55b at the end of said slideway 55.

Entry slideway 55 is removable as indicated in Figures 1 and 2, and it is shown removed in Figure 6, which indicates that both the upper end of said slideway 55 and its horizontal bottom carrier plate 55c have the apertured ears 55m whereby the unit is adapted to be secured to the forward side wall I6c by means of screws 55', as indicated in Figure 3. The forwardly projecting end of plate 550 preferably engages in a groove 58 of the adjacent side wall 160, while the rearwardly projecting end of the plate 550 underlies a shoulder in the opposite side wall I612, all as shown in Figure 3.

The entry slide carried plate 550 has the bearing lug projecting from its bottom adjacent the terminal coin slot 55b. This lug 59 carries the bearing pin 60 whose ends engage the apertured ears 6Ia of a vertically rockable coin-actui ated lever 6|. This lever 6| has the plane upwardly ofiset head portion 6H) and the elongated tail portion 61d. The plane head portion 6lb has the coin slot 6Ic which willbe normally aligned with the terminal coin slot 55b of the entry slideway 55 and is coincident in length with the latter, or substantially so.

However, one end portion of the head slot 610 of lever Si is normally closed by the plane underlying and laterally offset head end 63a of horizontally swingable coin release lever 63, which is vertically pivoted, as at 62, to lever 6| below the horizontal supporting pivot 60 of the latter. Thus, a coin from slideway 55 will be retained in the slot Me of the coin actuated lever 6| until coin release lever 63 has been operated to clear its offset head end 63a from said slot 610. The coin release lever 63 has a downwardly and outwardly inclined tail portion 63b providing a cam which is adapted to be engaged by the cam 410 of lever 41, as will be more fully explained hereinafter.

It should here be noted that coin release leyer 63 has the side lug 630 which is engageable with the edge of lever 6| for limiting movement of its head end 63a inwardly of the head slot 6lc of lever 6|. Figures 3 and 9 show that a spring 64 which is carried by pivot 62 has one end 64a anchored to the cam end 63b of lever 63, and its other end 64b anchored to the head end 6") of lever 6l'to normally hold the lever 63 with its head 63a in slot end-closing position.

Figures 3- and 6 illustrate the medial boss 65 projecting from the bottom of the coin entry slide carrier plate 550 and likewise the vertically slidable pin 66 depending from said boss immediately above the tail portion 6Id of the vertically rockable coin actuated lever 6|. Referring to Figure 6, it will be noted that a counterbore 65a of boss 65 is provided to receive the head 66a of pin 66, and that said counterbore 65a extends through plate 55c.

Figure 6 also indicates the coupling pin 61 for connecting the outside knob-operated sleeve 21 with the shaft of lever 41, and which coupling pin is disposed in counterbore 65a to normally rest upon pin head 66a with its upper end flush with, or slightly below the plane of the top surface of plate 550.

As indicated in full lines in Figure 3, the weight of the arrested coin 52a in head slot 6| 0 of lever 6| overcomes the weight of the tail portions 6ld, 63b of levers 6|, 63, and results in said lever assembly rocking counter-clockwise from the normal full line position of Figure 6. This results in tail portion 6ld of lever 6| pushing pin 66 upwardly in counterbore 65a of boss 65 to project coupling pin 61 fully into the aligned holes 21.1: and 46a: of the superjacent sleeve 21 and shaft 46 so that they will turn as a unit under the action of outside knob 44 (Figure 5).

Figures 3 and 6 also show that the upper surface of entry slide plate 55c has the arcuate keeper strip 68 which embraces the rotatable outside knob-actuated sleeve 21 in the path of hole 211: so as to retain the coupling pin 61 in operative position while the coupled sleeve and shaft assembly 21, 46 vis being turned to retract the bolt 23, etc.

Below th' terminal slot 551) of the entry slideway 55 and the coin actuated lever assembly 6|, 63 is the downwardly, forwardly and inwardly inclined coin slideway 69 which in the present instance is a fixed part of the casing section l6 being carried by the rear side wall l6b thereof, as shown in Figures 1, 2 and 3. The lower end of coin slideway 69 terminates in closely spaced relationship to and opposite to the window 53 in the casing closure section H, as indicated in dotted lines in Figure 3, and previously referred to.

Releaseable means (best shown in Figure 8) is provided to arrest a previously used coin 52 opposite said window 53, and in the present instance said means takes the form of a lever 10 which is pivoted as at 1| to the under side of and adjacent one side of said slideway 69 at the end thereof. Said lever 10 has an upturned lower end lug 10a and this lug is normally caused by spring 12 to overlie one side portion of the discharge end of slideway 69 to arrest the coin 52 opposite window 53. One end 1241 of spring 12 engages a depending post 13 of slideway 69 while the other end 12b engages the laterally extending tail portion 10b of said lever, it being noted that the intermediate portion of said spring 12- is coiled about the pivot 1|.

The tail portion 10b of lever 10 has a lateral lug 10c adapted to be engaged by latch detent 41b of lever 41- as same moves to the left (as viewed in Figure 3), so as to move lug 10a. to the right as viewed in Figure 3, to permit the coin 52 to drop into coin box [8 from display position opposite window 53. When the lower end of lever 41 moves to the right (Fig. 3) latch detent 41b simply backs into housing 41a against the backing spring therein and slides past lug 10c without moving lever 10. A stop 13a carried by slideway 69 sustains lever 10 against the action of spring 1 I as indicated in Figure 8.

The occupancy indicator 5 disposed slideway 11 of an actuator plate 18.

This latter slideway n is adjacent the front edge of top wall |8d.

Intermediate the sides of the indicator plate guideway 18 said top wall |8d has a transverse slot 19a through which projects from indicator plate 18 a pin 18. A coil spring 88 carried by post 8| projecting from the bottom surface of top wall I81! and having its free end 88a engaged with pin 19 normally urges the pointed or V-shaped end a of indicator plate 15 into the correspondingly shaped edge recess 18b of actuator plate 18 so as to tend to normally retain said actuator plate in the full line position shown in Figure 5.

Actuator plate 18 has the depending pin 18a extending through the longitudinal slot 83 in said top wall |8d in a position to be engaged by the lateral upper end 41d of lever 41 when the latter is moved to the right (Fig. 3) to retract latch 23. This means that said lever portion 41d will engage pin 18a and throw actuator slide plate 18 to the right. This action causes the wall 18b of said actuator slide recess to cam against the frontal edge 15a of indicator plate 15 to force it toward back wall |8a of section l8. And the result is that the legend Vacant (denoted at 84) will disappear from the top wall window 85, of

closure casing section l1, and be replaced by the .legend "Occupied" 88, both of which legends are of course imprinted upon the upper surface of indicator slide 15.

The indicator and actuator slide plates 15, 18 will remain in the Occupied indicating position until the inside knob handle 3| is operated, be-- cause in this position the pointed frontal edge 15a of the indicator plate is clear of the recess 18b and bears against a straight edge portion of the plate 18 as shown in broken lines, Fig. 5. It

entry slot or opening 58-so as to prevent insertion of another coin through slot 51 of closure casing H. v

When inside knob handle 8| is turned the lateral end portion 38c of lever 38 engages actuator slide plate pin 18a to force said actuator plate 18 to the left (Fig. 3) whereupon spring 88 returns indicator slide plate 15 to the full line position of Figure 3.'

Figure 5 shows the actuator slide 18 as having the lineal guide slot 81 opening from its forward end and receiving the guide pin 88 which rises from the top wall |8d of casing section l8. It will be understood that pin and slot 81, 88 assist in guiding and sustaining the forward end of the.

actuator slide 18 when it is in the forward position to close coin slot 58 as shown in dotted lines in Figure 5.

- The operation The operation may be summarized as follows: The coin 52a having been inserted through the registeringcasing slots 58, 51 (see Figs. 3 and 6), it slides down guideway 55 and over the hump 55a, therein (see Fig. 6) which causes it to enter g'uideway terminal slot 55b and slot 8|c of pivoted lever 8|. Since the head end 880 of lever 83 (see Figs. 3, 6 and 9) is normally caused by spring 84 to overlie one end of lever slot 8|c the coin 52a is arrested andthe lever assembly 8| 82 rocks vertically about pivot 88 from the normal position (Fig. 6) to the position shown in Figure 3.

The movement of lever assembly 8|, 88 from the.Flg. 6 position .to the Figure 3 position results in the tail portion 8|d of lever 8| pushing the depending pin 88 (see Fig. 6) with which it 4 should here be noted that the forward end of slide plate 18in this position overlies the coin is engaged upwardly in the boss 85. This move- .ment of pin 88 causes its head 88a to push coupling pin 81 into the aligned holes 212:, 48:: of

the outside knob-controlled sleeve 21.and its.

contained shaft 48 which latter carrie lever 41' and the counteroperating fork 48. Thus, members 21, 48 are coupled and will turn as a unit under control of the outside knob 44-which as will be understood is fast to sleeve 21.

To retract latch bolt 23 the outside knob 44 is turned to actuate the coupled sleeve and shaft 21, 48 in a clockwise direction as viewed in Figures 2 and 3. This causes the lower portion of the lever 41 to engage the lateral lug 28a of bolt 23. Referring to Figures 3and it will be.

noted that at about the same time this movement results in the operative engagement of the lever carried detent 41b with the laterally bent end 100 oi lever 18 to swing the latter in a direction to clear its opposite end "Ia-from its normal position in which it partially closes the discharge end of the lower coin guideway 89 to support the previously used coin 52 opposite the display window 53 of easing closure section I 1 (see Figure 3).

While the previously used coin 52 is being released from window and while bolt 23 is being retracted by the lower part of lever 41, the upper end 41d thereof is pushing the actuator slide member pin 18a (Figs. 2, 3 and 5) to move the actuator slide 18 to the right as viewed in Figs. 3 and 5. This causes the occupancy indicator plate 15 to be cammed outwardly against the action of spring 80 (Figs. 2 and 3) by the actionerated from the outside.

Following actuation of lever 10 by lever detent 41b-see Figs. 3 and 8-to release coin 52 from window 53 and after spring 12 has returned lever 10 to the Figure 8 position, the cam 410 of lever 41 engages the tail cam portion 63b of lever 82 (Figs. 3, 6, and 9) and swings it about pivot 82 to clear its ofl's'et head 63a from slot 8|c of lever 6|. This releases the second coin 52a to drop into slideway 89 and pass to display position behind window 53.

Also in the bolt retracting movement of lever 41, actuated by the knob 44 and the connected sleeve and shaft; 21, 48 the fork 48 is moved clockwise (Fig. 3) to operate the counter 49 (see Figs. 3 and 4).

While on the subject of retraction of bolt 23 by the outside knob-controlled lever 41, it should be noted that the. lateraJ"--top extension 231) passes between the tail portions of levers 8|, 83 (see Figs. 3 and 6) and maintains bearing contact with lever 8| to hold the lever assembly 8|, 88 in the Figure 3 position entirely irrespective of the weight of coin 52a in the head slot. 8|c of lever 8| (see Figs. 6 and 9). This action is important because conceivably jerky handling of the door knob 44 and door 2| might otherwise cause the lever assembly 8|, 83 to rock from the Figure 3 position toward the Figure 6 position sufliciently' to allow the actuator pin 88 and coupling pin 61 (see Fig. 6) to drop suiiiciently to bring the coupling pin into its hole in plate 550. In other words, the top. extension 23b of bolt lug or cleat -23a is a safe-guard against jamming of the lock after the deposit of coin 62a but before the connected sleeve 21 and shaft 66 (see Fig. 6) have been turned sufficiently to dispose the lower end of coupling pin in line with the arc-uate keeper strip 63.

So much for the things that take place after retraction of the bolt 23 through the operation of the outside knob 66, following the coupling of the lever and countercarrying shaft 66 by pin 61 by the action of lever assembly 6|, 63 under the influence of coin 62 of Figure 3.

When knob 66 is released spring 26 (Figure 3) acts through the sleeve-carried arm 26 (Figure 3) to protract latch bolt 23 again and since keeper strip 66 (Figs. 3 and 6) retains pin 61 in coupling position as to sleeve 21 and shaft 66 the latter actuates the counter fork 66 and the lever 61 back to the Figure 3 position. The return of lever 61 to the Fig. 3 position, of course, leaves the occupancy indicator 16 and its actuating slide 16 in the dotted line position of Figure 5 because the end 61d of lever is always behind pin 16a of slide 16 and thu cannot return the same to the Fig. 3 position. The word "Occupied remains displayed in slot and the forward end of slide 16 prevents insertion of a coin through slots 56. Release of the coin 52a (Fig.3) from the lever assembly 6|, 63 permits the latter to swing back to the Fig. 6 position, thereby lowering pin 66 in bore 65a and permitting the coupling pin 61 to drop back to the Fig. 6 position when it becomes aligned with said bore upon the return rotation of the coupled sleeve 21 and shaft 66 under the influence of spring 26. This, of course, uncouples the sleeve 21 and shaft 66.

Return of lever 61 to the Figure 3 position has no effect on the lever 10 (Figs. 3 and 8) because the beveled rear face of detent 61!) (Figs. 3 and '7) simply causes said detent to back into its housing 61a against the action of coil spring 61c and simply slide past the end 100 of said lever 10.

Now as to the matter of the retraction of latch bolt 23 by the operation of inside knob 3|.

Turning of the inside knob 3| in a counterclockwise direction as viewed in Figure 3 results in the knob shaft carried lever 36 engaging the bolt cleat or lug 23a and retracting bolt 23 from the Figure 3 to the Figure 1 and 2 position. And this action also results in the laterally turned end 360 of lever 36 engaging the depending pin 16a of the indicator actuating slide 16 to move .the latter from the coin slot closing dotted line position of Figure 5 to the full line position there shown. This means that when recess 16b of slide 16 reaches the pointed inner end 16a of indicator plate 15, the spring 66 (Figs. 2 and 3) will return indicator 16 to the full line position of Figure 5 and the legend Vacant will again be displayed in the slot in the top wall of closure casing section l1. When the inside knob 3| is released, the spring 26 pulls the lever 36 to the Fig. 3 position (the broken line position of Fig. 1) and at the same time rotates sleeve 21 and arm 26 carried thereby in a counter-clockwise direction (Fig. 3). The arm 26, of course, engages lug 23a of latch bolt 23 to protract the latter. This is accomplished without interference by the arm 61 which has previously been returned to the Fig. 3 position by the release of the knob 66 and uncoupled from sleeve 21 by the dropping back of the pin 61 into the counterbore 65a as aforesaid. 'The lock is now ready for operation again and the last used coin 62 remains displayed in window'63 (Fig. 3) so that the'custodian of the washroom can readily take note of the fact in case a slug has been used by the last patron, in place of a coin, and before said patron leaves the room.

There remains to be emphasized the novel multifold function of coil spring 26 of Figure 3. By coupling its ends to the outside knob'controlled sleeve 21 and to the lateral end 360 of the inside knob-controlled lever 36 it serves the purpose of two springs in that it yieldably holds lever 36 in the Figure 3 position and acts through the sleeve-carried arm 26 to hold bolt 23 protracted. But in a larger sense this is not all that spring 26 does. It serves the purpose of two springs of diflerent strength. This is so. because, of its terminal connections to inside knob operated lever end 36aand outside knob-operated sleeve 21 it will offer greater resistance to retraction of bolt 23 by lever 36 than to the bolt retractive movement oi sleeve 21 and its then coin coupled shaft-carrier lever 61.

To explain further, reference being had to Fig.

3, it will be clear that when inside knob-con normal resistance of spring 26 is augmented by simply the slight clockwise turning of sleeve 21' that is necessary to cause lever "to engagebolt cleat 23a and retract the bolt to the Figure 1' position from the Figure 3 position.

There is a reason for desiring different strength spring resistance to operation of bolt23 by outside knob 66 and inside knob 3|. The explanation is that the inside knob controlled lever' 36 has only two things to do, namely retract bolt 23 and retum the actuator slide 16 from the dotted line 'position of Figure 5 to the full line position and, of course, as to this latter spring 66 of Figures 2 and 3 will assist as soon as recess 16a (Figure 5) reaches the pointed end ofindicator slide 16. On theother hand, the outside knob-controlled lever 61 has in the aggregate a lot of resistance to overcome in that it has to operate the lever 16c, 16, 16a to release coin 62, the lever 63, 63a, 63b to release coin 62a besides retracting bolt 23 and actuating slide 16 through pin 16a from the full to the dotted line position of Figure 5. And furthermore, there is friction between bolt cleat extension 23!) and the tail part of le'ver 6| as aforementioned when lever 61 is operated. On the other hand, the lever assembly 6|, 63 is in the Figure 6 position when inside knob-controlled lever 36 is operated and no such slight frictional resistance obtains.

Summing up the matter of spring 26, the added effect of it with the other factors mentioned makes the knobs 36, 66 turn and the lock operate under just about equal pressure or power.

In reference to the counter fork 66, 66a and lever 61, it will be understood that their respective slots 6|, 56a, in sleeve 21 are of suflicient length that the free rocking of the sleeve 21 about shaft 61 under the action of bolt cleat 23a and sleeve arm 48 ,will not effect the movement of either the fork '48, 48a or lever 41.

claim as new is:

1. A. door lock, comprising in combination, a casing, a latch bolt, protracting means engaging said latch bolt to protract the same, spring means loading said protracting means to maintain said bolt protracted, movable means controlled by an inside door knob, separately operable movable meanscontrolled by an outside door knob, each knob-controlled means including a portion engageable with said bolt to retract the same, means connecting one of said knob-controlled means to said spring means, the other knobcontrolled means being normally disconnected from said spring means, and means operable to connect said second knob-controlled means to said spring means.

2. A coin controlled door lock, comprising in combination a casing, a normally protracted latch bolt, means operatively connected with an inside knob of said door to retract said bolt, separately operable knob-controlled means adapted to be operatively connected with an outside knob of said door to retract said bolt but being normally disconnected from said outside knobfcoin operated means for connecting said last named bolt retracting means with said'outside knob, a coin arresting member incorporated therein, a movable coin release member incorporated in said coin arresting member, a coin discharge guideway adapted to receive a coin from said arresting means, a wall of said casing being adjacent a portion of said guideway and having a coin display window therein opposite said portion, a second coin arresting means associated with said portion of said guideway and including a second movable coin release member, and means incorporated in said bolt-retracting portion of said outside knob-controlled means engageable with both of said coin release members to actuate both of the same, as said bolt is retracted by said outside knob-controlled means.

3. The structure of claim 1, said second knobcontrolled means being said outside knob-con trolled means, said last named means comprising coin-controlled means, a coin arresting member incorporated therein, a movable coin release member incorporated in said coin arresting memher, a coin discharge guideway adapted to receive a coin from said arresting means, a wall 01' said casing being adjacent a portion of said guideway and having a coin display window therein opposite said portion, a second coin arresting means associated with said portion of said guideway and including a second movable coin release member, and means incorporated in said bolt-retracting portion of said outside knobcontrolled means engageable with both of said coin release members to actuate both of the same, as said bolt is retracted by saidoutside knobcontrolled means.

4. A coin controlled door lock, comprising in combination, a casing, a normally protracted latch bolt, means operatively connected with an inside knob of said door to retract said bolt, separately operable knob-controlled means adapted to be operatively connected with an outside knob of said door to retract said bolt but being normally disconnected from said outside knob, coin operated means for connecting said last named bolt retracting means with said outside knob, a coin arresting member incorporated therein, a movable coin release member'incorporated in said arresting member, and means incorporated in said last named bolt retracting means engageable with said coin release member to move the same to release a coin as said bolt is retracted by said last named bolt retracting means.

5. A door lock comprising in combination, a casing, a normally protracted latch bolt, a pair of knob-controlled bolt retracting means, said means being separately operable, one of said means being operable by an inside door knob, the other of said means being operable by an outside door knob, a movable two position indicator incorporated in said casing, a bolt actuating lever incorporated in each of said separately operable knob-controlled bolt-retracting means, said levers havingportions crossing one another adjacent their outer ends, actuating means for said two position indicator between and in the path of movement of the extensions of the crossed portions of said levers, and said acauting means being adjacent one lever in one of its positions and adjacent the other lever in its other position whereby the'indicator will be actuated from one position to another by bolt retracting operation of said levers.

6. A door lock comprising in combination, a casing, a normally protracted latch bolt, a pair of knob-controlled bolt retracting means, said means being separately operable, one of said means being operable by an'inside door knob, the other of said means being operable by an outside door knob, a movable two position indicator; incorporated in said casing, a bolt actuating lever incorporated in each of said separately operable knob controlled bolt-retracting means, said levers having portions crossing one another adjacent their outer ends, actuating means for said two position indicator between and in the path of movement of the extensions of the crossed portions of said levers, and said actuating means being adjacent one lever in one of its positions and adjacent the other lever in its other position whereby the indicator will be actuated from one position to another by bolt retracting operation of said lever, a single spring means operatively connected to both of said knob-controlled means and tending to retain same against bolt retracting movement, and one of said knob-controlled means having a portion disposed in the retraction path of said bolt to tend to maintain said bolt protracted.

'7. In a coin controlled door lock having a casing, a latch bolt, and knob-operated bolt retracting means comprising a knob carried section and a normally disconnected bolt retracting section; the combination of a coin guideway in said casing, a support for said guideway adjacent said sections, and coin-operated connecting means for said sections carried by said guideway support.

8. In a coin controlled door lock having a casing and a latch bolt; the combination of a knob operated sleeve rotatably carried in said casing, a shaft in said sleeve and normally rotatable relatively of the latter, a bolt-retracting lever carried by said shaft, said sleeve and shaft having normally aligned holes, a coupling pin adapted to be projected into said holes, an actuator for said pin, a support and guide for both coupling pin and its actuator, and coin controlled means for operatively moving said actuator to move said coupling pin to operative position.

9. In a coin controlled door lock having a casing and a latch bolt; the combination of a knob operated sleeve rotatably carried in said casing, a shaft in said sleeve and normally rotatable relatively of the latter, a bolt-retracting lever carried by said shaft, said sleeve and shaft having normally aligned holes, a coupling pin adapted to be projected into said holes, an actuator for said pin, a support and guide for both coupling pin and its actuator, coin controlled means for operatively moving said actuator to move said coupling pin to operative position, and keeper means embracing said sleeve in the direction of turn thereof when retracting said bolt whereby to retain said coupling pin in operative position.

10. The combination set forth in claim 8, and including a coin guideway in said casing, a support for said coin guideway, and said coupling pin support and guide being carried by said coin guideway support.

11. The combination set forth in claim 8, and latch bolt carried means engaging said coin controlled means following coin operation of same and upon start oi retraction oi. the bolt whereby to hold said coin controlled means in operative position so long as the bolt is even partially restricted.

12. Coin display and release means for a coin control lock having a casing, and latch bolt retracting means, a coin guideway section having a portion disposed adjacent a wall of said casing, said casing wall having a window opposite the proximate portion 01' said coin guideway, a lever pivoted to the bottom of said guideway and providing a coin arresting portion extending laterally from one end of the lever, and also providing an actuating portion extending in the opposite lateral direction at the other end of the lever, spring means carried by said guideway and normally retaining said coin arresting portion in said guideway adjacent the site of said window whereby to arrest the coin for display therethrough, the laterally turned actuating portion of said coin arresting lever being normally disposed in the path of a portion of said bolt retracting means, said bolt retracting means being movable back and forth past said actuating portion, a depressible detent on said bolt retracting means and having a portion adapted to momentarily engage said actuating portion 0! said coin arresting lever to operate the same without depressing said detent when said bolt retracting means moves past the same in one direction, said detent having a bevelled portion engageable with said actuating portion of said arresting lever as said bolt retracting means moves past the same in the opposite direction whereby said detent will be depressed by said actuating portion of said coin arresting lever and will slide past the same without actuating said coin arresting lever.

13. The combination of claim 8, said sleeve being controlled by a knob on one side oi the door, a second bolt retracting lever operatively connected to a knob on the opposite side of the door, and a single spring means operatively connected to both said sleeve and second bolt retracting lever and loading the twain for movement in a bolt retracting direction.

CARL HOFFMAN. 

